Rover v8 headers

[goin2fast52]

why do the rover v8 headers go forward instead of backwards? i don't know how to post pics,but there's a good cutaway pic of a tuscan racer out there that shows the headers really well. also, if you get evo, look at their project capri. that also has the forward headers.

[HarryW]

If, as I think, you mean the exhaust manifold then I beleive they go forwards so that the engine can be sat further back, its a neat solution keeping the whole lot within the tight confines of the TVR chassis.
It also would I imagine help keep some of the large excceses of heat generated out of the cabin/tunnel, believe me there is a lot of heat generated .

Harry

[goin2fast52]

thats interesting. then does the rest of the exhaust just go back after the headers?

[19560]

The exhaust goes to the front of the engine, down and underneath to the back of the car with both the Griff and Chimp. There isn't any room to do anything else. The wedge manifolds just manage to swing down and back but the engine is further forward in these cars.

[goin2fast52]

then how come in evo's project capri the headers go forward? it looks like there's plenty of room in its engine bay.

[boosted ls1]

Nobody has replied to your last post. Maybe we don't know what your asking?

Anyway, maybe they couldn't get around the steering column. Capri's have a pretty narrow engine bay and a grotty clutch master cylinder arrangement. Put an RV8 in there and life gets really difficult. I know how tight it is! Don't know what evo are doing as your post isn't very clear. Why don't you ask evo what they're on with they will know.

>> Edited by boosted ls1 on Thursday 14th August 22:07

[19560]

Yep, bl1 is right . I've found a copy of EVO now. The engine is VERY close to the bulkhead and the steering column is in the way although you have to study the picture carefully because most of the steering column is missing. also £7k for an exhaust system is rediculas.

[v8 jago]

Mantas are the same, their is no room and the steering colunm is in the way so my mate made his own exhausts where the drivers side goes right round the front and back down the passanger side and meets up with the passangers manifold. His manifolds cost him 2 rolls of welding wire and a days labour..

[2 sheds]

goin2fast52 said:

why do the rover v8 headers go forward instead of backwards? i don't know how to post pics,but there's a good cutaway pic of a tuscan racer out there that shows the headers really well. also, if you get evo, look at their project capri. that also has the forward headers.

The majority of Rover headers go straight down, TVR Wedges etc had these. when they revised the Chassis for the Griffith etc it was easier to bring them forward above the chassis and then back under/ beside the engine, importantly this also lengthens the exhaust potentially producing better torque.
However the best systems have a slightly downturned straight section leaving the head before a bend, sadly no space in a TVR for this.
Tim

[HarryW]

I assume the V8S was the first Tiv to route them this way then . Just need a way to get them follow the exhaust ports downwards for a little bit before going forwards to release a bit more power .

Harry

[19560]

Didn't the Tuscan racer pre-date the V8S?

[HarryW]

19560 said:

Didn't the Tuscan racer pre-date the V8S?

I'll give you that, by two years . However the V6 S's sweep forward albeit not as far .

Harry

[goin2fast52]

thanks for clearing that up

[jamieheasman]

In the case of the TVR having the 'headers' sweep forward also improves heat transfer (or damage) into the cabin and also provides plenty of room to fit the enormous cats!

Would this Capri be using TVR manifolds? It would make sense as they'd be easily sourced from a wreckers.

[IPAddis]

jamieheasman said:

Would this Capri be using TVR manifolds? It would make sense as they'd be easily sourced from a wreckers.

No, custom stainless headers with big curvy bits IIRC.

[MGv8]

Flow from the engine is important. As each pulse of gas flows out the next should just flow it. What you are looking to do is have the first pulse suck along the second. The is done by changing the size and length of each pipe in the manifold. Tuned pips take up more room than standard pipes and so making them go forwards first what a neat trick for more room by TVR.

[MGBV8]

Any advice on the best system to suit a MG-
traditional block huggers
The RV8 system 4 into 1 exiting via inner wing
or 4 2 1 exiting inner wing

Also what is the best exhaust system
standard single large bore or balanced twin